If I was small dude I come to school the next day with 3 razors.
I grab a txt book ask for hallpass go behind yo while that nikka sleeping on the desk( He most likely going to be sleep in class anyway) rock the back of his head with the text book and when he jumps up slice him up if he grab the razor in the tussle pull another one out.
Keep slicing to school cop come or until he run out the class.
That just how I would handle it if I was lil dude.